The operational hydro-meteorological forecasting concept was born in the 70' and implemented at Electricité de France - Division Technique Générale at the beginning of the 80'. Initially dedicated to support hydropower plants management, the activity has never stopped growing and now addresses issues of all kinds of EDF facilities : plants security, regulatory requirements, water resources management. Discharge forecasting and flow risk monitoring are based on an extensive measurement network and on meteorological and hydrological models ; we illustrate this organization with the example of the Mediterranean precipitation event occurred in November 2008. Precipitation forecasts are still the main source of uncertainty, so that an automated flow forecasting system is still unattainable. In the meantime, keeping experimented forecasters teams remains a necessity.

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